My KZ has been a really good unit. One small leak at a window that the dealer fixed under warranty. Quality control appears good and the manufacturer has a great reputation.
One thing to look at is the 2008 Onan generator. Google it, but some '08 units had a bad batch of fuel pumps. My TH is a 2011, but the generator was built in 2008 and installed new in my TH. I couldn't get my generator to start and got hold of the Onan service center. When I gave them my serial # they said it must have been a used unit and wouldn't be under warranty. I got the dealer to state is was a new unit and I got the pump replaced under warranty. The Onan warranty facility wanted me to leave my trailer, but I just picked up the fuel pump and installed it myself. No probs since then.
Just test the generator well to make sure it works good, check to see if yours was one built during the bad fuel pump batch, and if it was have the dealer change it if it hasn't all ready been done.
Price does seem high.